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Double Extended memory module HP41cx.. - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: Double Extended memory module HP41cx.. (/thread-134386.html) |
Double Extended memory module HP41cx.. - Geoff Quickfall - 03-15-2008 Call me slow, but can I find the 'how to' guide to installing two extended memory modules into one module or into the HP41cx itself. I have spent quite some time searching through the site, and using google site search tool all to know avail. Lots of postings on the extended memory and double x memory but only side talk about the journal article at the museum and etc. I am looking for the actual with photo how to on doubling up the x-memory module or better yet the article on installing the chips internally and lining them up on either side of the battery compartment. The reason is I want to free up a port for a clonix41 module which will include a series of my programs as well as the CCD module and whatever else I can cram into it! Cheers, Geoff
Edited: 15 Mar 2008, 7:54 p.m.
Re: Double Extended memory module HP41cx.. - Allen - 03-15-2008 Easy, Thanks and just call me Homer ;-o. Anyone done this internally? - Geoff Quickfall - 03-15-2008 D**m, I thought I tried this and I KNOW I have seen the article. Many thanks and I will give it a try. The other point would be, has anyone done this hardwired internally. If so pointers would be appreciated or I might just play this safe and leave it in the module.
Cheers, and thanks Geoff
Re: Double Extended memory module HP41cx.. - PeterP - 03-15-2008 Geoff,
Cool overlay! I once went through the trouble of reading all the PPC, CHUU, Datafile, etc journals that are available on the various DVD's and print out and sort the articles into themes. So I have a bunch of articles that are related to double/tripple modules, some of them from the old days talking about normal memory modules. Some of the maybe more relevant articles for your effort can be found at: PPC V8N1 p20 - Installing modules inside the HP-41C Let me know if you do not have access to the PPC journals mentioned and I shall find a way to get them to you (fax, mail. No scanner in reach right now...) You can reach me via email here, just make sure that there is a HP-41 reference in the subject line, as there simply is too much spam covering that inbox (sorry Valentin for borrowing your trick, I hope you do not mind)
Cheers, Peter
Re: Double Extended memory module HP41cx.. - PeterP - 03-15-2008 Allen solved your problem much quicker and better... FWIW, for doing it internally, maybe the first article mentioned (V8N1 p20-21) might give you some ideas. It has a picture showing two memory modules internally. Cheers
Peter
Re: Double Extended memory module HP41cx.. - Allen - 03-15-2008 Here are some internal pictures.. a little better than the hand drawings of what you may expect inside.
Re: Thanks and just call me Homer ;-o. Anyone done this internally? - Allen - 03-15-2008 If you can bear the pain, I would strongly recommend the modules vice modifying the 41CX. Here are some things to consider:
IMHO Pro's of the module approach:
I will try this again but the spam police may intercept this message: - Geoff Quickfall - 03-15-2008 Thanks Allen and Peter for your direction and references.
Cheers, Geoff
The overlay is printed using... - Geoff Quickfall - 03-16-2008 microsoft word and formatting the font and size until it prints in scale to the overlay. I then print on a sheet of clear adhesive backed inkjet paper by avery. Using a razor blade and steel ruler I slice each row and then place on the overlay. Sure beats the Letraset I used back in the early 80's.
Geoff
Re: Double Extended memory module HP41cx.. - Matthias Wehrli - 03-16-2008 I have done these modifications several time. I combined two X-Memory modules into a "Double X-Memory Module" and I combined a X-Functions and a X-Memory to a "X-FUNC & X-MEM Module".
The work is really hard as the wires you can use are extremly fine and the short and will desolder during your work many times. I need about 90 minutes for a module. Re: Double Extended memory module HP41cx.. - Eric Smith - 03-16-2008 Double and triple module conversion isn't much of a challenge! :-)
In the olden days, before the 82170A quad memory module, a few adventurous people like Bob Edelen were making the equivalent out of four 82106A memory modules. In order to make four of them fit, they had to be filed down, and the inside of the plastic module housing alos had to be milled down. The difficulty with this was that in some modules the bond wires were too tall, so filing the module would cut them. Bond wires are typically 25 to 32 micron diameter. There was no practical way to repair them, so the module was ruined. Edited: 16 Mar 2008, 3:19 p.m.
Thanks for the pointers, references and ...... - Geoff Quickfall - 03-16-2008 Everyone, thanks again for the help. As of now I have 2 x memory sitting in my calc and need them for work so I have 2 spares on there way along with some empty modules already opened and waiting. I will update all when they arrive and are completed. Matthias Wehrli, thanks for your offer and if I mess up (hope not) I will be contacting you. If I do not mess up I will set the second two into a module and end up with one double xmemory per HP 41cx (my spare also). I tried to email you but that function has been turned off during Peters spam check. I will try again later when it allows me back in.
Cheers, Geoff
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